You know how many of the "cool" people you've seen are kicking themselves over stupid shit they've said throughout the years, even that supercool funny line you busted out laughing at last night? Practically all of them. The trick with "lowered inhibitions" (not as good an idea as you think it sounds, better than it really does if you don't get stupid) is that you stop thinking that crap and go on ahead and say it anyway. Sometimes it bombs, doesn't make sense, and confuses people. A lot more often, you give them an interesting line of thought. With practice, you can even get a conversation started. Especially if you stick to something kind of relevant to the person you're talking to.
What's that, you don't know what's relevant to them? So start out talking a bit about stupid little bullshit until they tell you something that they like. Once you find your likes matching up, there you go. You're both pretty into Rush, especially 80s period synth? Good, talk about that! Mention that's around the time that Neil Peart started getting into electronic triggers, but didn't like how they sounded, so at first he recorded his own voice as the sound it played back.
Both into fantasy books? Cool, tell them all about Terry Brooks and David Eddings, they might tell you stuff about Terry Pratchett and Neil Gaiman. And yes, there's a reason I put those last two together, believe me!
Or maybe you both have an interest in ancient history? What the fuck ever, it doesn't matter, we all have something in common with everyone else, it just isn't always the same things. Being willing to talk about and fall on your face a few times, and then carry on, that helps a lot more than you think. I'm still a dork, but I can actually get along with pretty much everybody, because I've found how to look for the things I have in common with each. And better, if they're interested, we can even explore each other's differences. There's almost always something you can find you'd like to know more about something you didn't know you liked . . . and others will love to learn the same from you. Just don't be an asshole.